Add single request context to MR Analytics

What does this MR do?

This MR adds additional context to the MR Analytics throughput chart and table Apollo configuration. The additional context is used to send the requests individually opposed to having all requests sent in a single batch.

How to test:

1. Make sure you have starter plan.
2. Enable the feature: Feature.enable(:project_merge_request_analytics)
3. Navigate to the page: some project / analytics / Merge Requests

Screenshots

Note the visual changes of each loading icon completing individually in the second example. This results in a faster time to first visual change.

Batch requests only	Individual requests
Screen_Recording_2020-08-18_at_13.25.54	Screen_Recording_2020-08-18_at_13.28.34

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team

Related issue

#232651 (closed)